Sometimes you might do something bad for you and then immediately dream of a bleeding mouth, prompting you to stop, but honestly in most cases it takes more than that to get someone’s attention. In many cases a person will dream of a bleeding mouth time after time before they realize what it is trying to tell them, and by then it might be too late.
If you dream that you have a bleeding mouth it means that you have been doing something lately that you know is bad for you, and you continue to do it. A dream like this is usually a warning to stop doing that activity at all costs, lest you seriously endanger yourself. You need to stop what you are doing immediately if you hope to live and carryon unimpeded. This activity can be something relatively harmless like drinking. If you dream that you have a bleeding mouth after drinking a lot (assuming you are not an alcoholic to begin with) then this could just be your mind overreacting. You are scared that you will become an alcoholic even if the chance of that is relatively small. Do not let something like this get to you, just take it into account the next time you go on a drinking binge. What do you really want out of this activity? Ask yourself that.
To dream of a bleeding mouth may also suggest that you rush into things too clearly without thinking them over beforehand. When you eat too fast, sometimes you can overreact and bite your tongue or the sides of your mouth causing bleeding. What a dream like this would suggest is that you are going to hurt yourself if you keep rushing things. Sometimes it is necessary to your own well being to go out and simply consider what you are getting yourself into before you make rash decisions.
This does not mean that you should not be doing those things; all it means is that you should think harder about your responsibilities and what you are doing to yourself before you go on making decisions. What is lacking here is a personal sense of responsibility. In order to be happy and in good health in the future, you need to calm down and learn to sort things out before rushing into big decisions. This is the most important artifact of information for you to cling onto for future use. In the end, you will be a bit more adult for having listened to it and following order.